PIC24F04KA201 Datasheet, PDF (148/224 Pages) Microchip Technology – 14/20-Pin General Purpose, 16-Bit Flash Microcontrollers with nanoWatt XLP™ Technology

PIC24F04KA201 FAMILY
REGISTER 19-2: AD1CON2: A/D CONTROL REGISTER 2
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
U-0
VCFG2
VCFG1
VCFG0
OFFCAL⁽¹⁾
—
CSCNA
—
bit 15
U-0
—
bit 8
R-0, HSC
U-0
BUFS
—
bit 7
R/W-0
SMPI3
R/W-0
SMPI2
R/W-0
SMPI1
R/W-0
SMPI0
R/W-0
BUFM
R/W-0
ALTS
bit 0
Legend:
R = Readable bit
-n = Value at POR
U = Unimplemented bit, read as ‘0’
HSC = Hardware Settable/Clearable bit
W = Writable bit
r = Reserved bit’
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-13
VCFG<2:0>: Voltage Reference Configuration bits
VCFG<2:0>
VR+
VR-
bit 12
bit 11
bit 10
bit 9-8
bit 7
bit 6
bit 5-2
bit 1
bit 0
000
AVDD
AVSS
001
External VREF+ pin
AVSS
010
AVDD
External VREF- pin
011
External VREF+ pin
External VREF- pin
1xx
AVDD
AVSS
OFFCAL: Offset Calibration bit⁽¹⁾
1 = Converts to get the offset calibration value
0 = Coverts to get the actual input value
Unimplemented: Read as ‘0’
CSCNA: Scan Input Selections for CH0+ S/H Input for MUX A Input Multiplexer Setting bit
1 = Scan inputs
0 = Do not scan inputs
Unimplemented: Read as ‘0’
BUFS: Buffer Fill Status bit (valid only when BUFM = 1)
1 = A/D is currently filling buffer, 08-0F, user should access data in 00-07
0 = A/D is currently filling buffer, 00-07, user should access data in 08-0F
Unimplemented: Read as ‘0’
SMPI<3:0>: Sample/Convert Sequences Per Interrupt Selection bits
1111 = Interrupts at the completion of conversion for each 16^th sample/convert sequence
1110 = Interrupts at the completion of conversion for each 15^th sample/convert sequence
.
.
.
0001 = Interrupts at the completion of conversion for each 2^nd sample/convert sequence
0000 = Interrupts at the completion of conversion for each sample/convert sequence
BUFM: Buffer Mode Select bit
1 = Buffer configured as two 8-word buffers (ADC1BUFn<15:8> and ADC1BUFn<7:0>)
0 = Buffer configured as one 16-word buffer (ADC1BUFn<15:0>)
ALTS: Alternate Input Sample Mode Select bit
1 = Uses MUX A input multiplexer settings for first sample, then alternates between MUX B and
MUX A input multiplexer settings for all subsequent samples
0 = Always uses MUX A input multiplexer settings
Note 1:
When the OFFCAL bit is set, inputs are disconnected and tied to AVSS. This sets the inputs of the A/D to
zero. Then, the user can perform a conversion. Use of the Calibration mode is not affected by AD1PCFG
contents nor channel input selection. Any analog input switches are disconnected from the A/D converter
in this mode. The conversion result is stored by the user software and used to compensate subsequent
conversions. This can be done by adding the two’s complement of the result obtained with the OFFCAL bit
set to all normal A/D conversions.
DS39937B-page 146
Preliminary
© 2009 Microchip Technology Inc.